What is the shape of the wave when two wave pulses travelling in the opposite direction cross each other?

The transvers displacement of a string (clamped at its both ends) is given by y(x,t) = 0.06 sin ((2pi)/(3)s) cos (120 pit) Where x and y are in m and t in s. The length of the string 1.5 m and its mass is 3.0 xx 10^(-2) kg. Interpret the wave as a superposition of two waves travelling in opposite directions. What is the wavelength, frequency, and speed of each wave ?

Two parallel wires carryiing current in the same direction attract each other, while two beams of electrons travelling in the same diection repel each other. WHy? Give reasons.

Opposite charges …………..each other.